Field orientations and sweep rate effects on magnetic switching of StonerWohlfarth particles
Abstract
Field angles and sweep rate dependence of coercivity of the StonerWohlfarth (SW) particles are studied based on the decayrate model. An analytic expression of the hysteresis loops based on the model is obtained as a function of applied field for various frequencies at various field angles with respect to the easy axis. Variation of the coercivities versus the sweep rate (measurement frequency), field angles, anisotropy constant, activation volume, and the combination thereof, and the distribution of easy axis, etc., have been obtained. Comparison with the thermalequilibrium and SW hysteresis loops are made. Coercivities of such a system generally increase with increasing sweep rate, anisotropy constant and activation volume, etc., hence decreases with increasing sweeping period. As a function of the field angles, the coercivity curve turns flat with increasing field angles and sweeping period.
 Publication:

Journal of Applied Physics
 Pub Date:
 August 1994
 DOI:
 10.1063/1.358424
 Bibcode:
 1994JAP....76.1726L
 Keywords:

 Angular Correlation;
 Coercivity;
 Decay Rates;
 Hysteresis;
 Magnetic Switching;
 Mathematical Models;
 Sweep Frequency;
 Analytic Functions;
 Bistable Circuits;
 Nonequilibrium Conditions;
 Numerical Analysis;
 SolidState Physics